Standing desk



FIG. 1 is a perspective of the standing desk;

FIG. 2 is a front elevational view of the standing desk;

FIG. 3 is a rear elevational view of the standing desk;

FIG. 4 is a left side elevational view of the standing desk;

FIG. 5 is a right side elevational view of the standing desk;

FIG. 6 is a top plan view of the standing desk; and,

FIG. 7 is a bottom plan view of the standing desk. 

CLAIM The ornamental design for a standing desk, as shown and described. 